Clarification on splitAtRoutes expectations?

[NullVoxPopuli]

For cross-referencing: josemarluedke/docfy#111

Docfy generates routes at build time and instructs users to make their router include addDocfyRoutes:

example router.js

import EmberRouter from '@ember/routing/router';

import { addDocfyRoutes } from '@docfy/ember';
import config from 'ember-cheat-sheet/config/environment';

export default class Router extends EmberRouter {
  location = config.locationType;
  rootURL = config.rootURL;
}

Router.map(function () {
  addDocfyRoutes(this);
});

I had tried to configured splitAtRoutes here: https://github.com/NullVoxPopuli/ember-cheat-sheet/blob/main/ember-cli-build.js#L23

splitAtRoutes: ['docs', 'docs.templates'],

which is the "name" of the routes.
Confirmable here: https://cheatsheet.glimmer.nullvoxpopuli.com/docs (with the ember-inspector open)

Is my configuration correct? did I miss something in the splitAtRoutes docs?

Could this be related to: #972
(I did try ember s with that environment variable, and it made no difference)

here is what running with splitAtRoutes uncomment looks like:

[ef4]

You need to switch to @embroider/router here:

https://github.com/NullVoxPopuli/ember-cheat-sheet/blob/f44bd9451621998156d8ab1ea0362bef577bbe1d/app/router.ts#L1

[NullVoxPopuli]

ah ok -- only 2 subtle mentions of this:

• https://github.com/embroider-build/embroider/blob/75344d894160e5f6b1951c5de89195a393394a46/packages/router/README.md
• https://github.com/embroider-build/embroider/search?l=Markdown&q=router

I must have missed it!
Thanks!